Mixing device



FIG. 1 is an oblique view showing the new design for a mixing device.

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The portions of the mixing device shown in the broken lines are includedfor illustrative purposes only and form no part of the claimed design.

The ornamental design for a mixing device, as shown and described.